Yeah, they are cool!
I used to see this one guy at the Rock Store(the famous roadhouse along Mulholland Hwy in the SoCal mountains) on Sundays, and who had a very nicely restored mid-60s BMW R60/2 "Boxer" equipped with a Steib sidecar, and his passenger was always his dog Olivia the Boxer.
He even had a little plaque made that he mounted right in front of where she sat and it read:
"Hi, I'm Olivia.
Please pet me!"
